>>namany+(OP)
I'd actually say the opposite is the case. B2B (even SaaS) is probably the most robust when it comes to AI resistance. The described "in house vibe coded SaaS replacement" does not mirror my experience in B2B at all. The B2B software mindset I've encountered the most is "We'll pay you so we don't have to wrestle with this and can focus on what we do. We'll pay you even more if we worry even less." which is basically the opposite of...let's have someone inhouse vibe code and push to production. B2B is usually fairly conservative.
>>kachap+FM
Sorry but tailwindui is not a SAAS. There is no service or hosting. You buy a coded template once and then receive updates. It is totally not the same as a critical B2B SAAS that is running 24-7 on the vendor's servers providing real support and service.